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. 2018 Dec 17;71:25. doi: 10.1186/s13620-018-0137-x

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Right lateral thoracic view. Vertebral heart size (VHS), long (L) and short (S) cardiac axes are shown. VHS is expressed as total units of vertebral length: 12.2v. Radiographic left atrial dimension (RLAD) is shown (white line). Both measurements were repositioned parallel over thoracic vertebrae beginning with the cranial edge of the fourth thoracic vertebra (T4). The size of the LA was thus expressed as total units of vertebral length: 2.6v